Programming Quiz on C

What is the equivalent code of the following statement in WHILE LOOP format?

for (a=1; a<=100; a++)

printf ("%d\n", a * a);

• a=1;

  while (a<=100)

  {

  printf ("%d\n", a * a); a++;

  }

• a=0;

  while (a<=100)

  {

  printf ("%d\n", a * a); a++;

  }

• a=1;

  while (a>=100)

  {

  printf ("%d\n", a * a); a++;

  }

• while (a<=100)

  {

  printf ("%d\n", a * a); a++;

  }

What is the output of the following code?

for (a=1; a<=5; i++)

{

for (b=1; b<=a; b++)

printf("%d",b);

printf("\n");

}

• 1

  1 2

  1 2 3

  1 2 3 4

• 1

  2 2

  3 3 3

  4 4 4 4

  5 5 5 5 5

• 1

  1 2

  1 2 3

  1 2 3 4

  1 2 3 4 5

• None

What will be the output of the following code?

int main() {

char str[] = "Hello";

printf("%c", *(str + 1));

return 0;

}

• H

• e

• l

• o

What is the output of the following code?

void fun(int *p) {

*p = *p + 10;

}

int main() {

int a = 5;

fun(&a);

printf("%d", a);

return 0;

}

• 5

• 10

• 15

• Error

What is the output of the following code?

int main() {

int x = 10;

printf("%d %d %d", x++, x++, ++x);

return 0;

}

• 10 11 13

• 12 12 12

• Undefined behavior

• Compilation Error

What is the output of the following code?int main() {

int x = 5, y = 10, z = 15;

int *arr[] = {&x, &y, &z};

printf("%d", *arr[1]);

return 0;

}

• 5

• 10

• 15

• 20

What is the output of the following code?

int main() {

int a = 3, b = 4;

printf("%d", a+++b);

return 0;

}

• 7

• 8

• 3

• Error

What line should be added to dynamically allocate memory for 5 integers?

int main() {

int *arr;

// ??

if (arr == NULL) {

printf("Memory not allocated");

return 1;

}

return 0;

}

• arr = malloc(5 * sizeof(int));

• arr = malloc(5);

• arr = calloc(5, int);

• arr = (int)malloc(5);

Fill in the blank to reverse a string using a loop.

int main() {

char str[] = "hello";

int len = strlen(str);

for (int i = 0; i < len / 2; i++) {

char temp = str[i];

str[i] = str[len - i - 1];

// ??

}

printf("%s", str);

return 0;

}

• str[len - i] = temp;

• str[len - i - 1] = temp;

• str[len - i + 1] = temp;

• str[i - len] = temp;

What should be inserted to correctly print elements of a linked list?

while (head != NULL) {

// ??

head = head->next;

}

• print(head->data);

• printf("%d ", head->data);

• System.out.print(head->data);

• cout << head->data;